Mechanical telephone



(No Model.)

EUR. SHAW.

MECHANICAL TELEPHONE.

No. 263,973. Patented Sep-t.5,1882

WITNESSES I INVENTOR @Cw; fzd fiaw BY ATTORNEYS.

UNITED STATES PATENT OFFICE.

FRANCIS It. SHAW, OF OHATHAM CENTRE, OHIO.

MECHANICAL TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 263,973, dated September 5, 1882,

Application filed July 11, 1882.

To all whom it may concern Be it known that I, FRANCIS It. SHAW, of Chatham Centre, in the county of Medina and State of Ohio, have invented a new and Improved Mechanical Telephone, of which the following is a full, clear, and exact description.

The objectot'myinvention is to obtain a more perfect operation of mechanical telephones in respect to clearncss of sound and length ot'line section of the same on line as m, Fig. 1. A is the case of the instrument, which may be of any usual construction, and is provided with a diaphragm, a, covering the aperture of the mouth-piece, as usual.

Behind the diaphragm a is a vibrator, b,

(No model.)

back of the case A and connected at the center with the vibrator b.

In operation, when the instrument is used as a transmitter, the vibrations of the diaphragm a are communicated by the wires 0 to the vibrator b, and from thence they pass upon the wire (I, and the reverse in case the instrument is used as a receiver.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- In combination with the diaphragm of a mechanical telephone, the vibrator I), connected with said diaphragm by pins 0, and at the center with the line-wire 6?, whereby the vibrations may be transmitted by the pin 0 from the diaphragm to the vibrator, or the reverse, as described.

FRANOIS It. SHAW.

Witnesses:

A. L. JASON, J. O. SNELL. 

